full source

test_cpu_detect.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+#include <thread>
+#include <algorithm>
+
+int main()
+{
+    unsigned int cores = std::thread::hardware_concurrency();
+    std::cout << "std::thread::hardware_concurrency() = " << cores << std::endl;
+
+    // Old formula
+    unsigned int oldThreads = cores > 2 ? cores - 2 : 1;
+    std::cout << "Old formula result: " << oldThreads << std::endl;
+
+    // New formula (my fix)
+    unsigned int newThreads = std::max(4u, cores > 6 ? cores - 2 : 4);
+    std::cout << "New formula result: " << newThreads << std::endl;
+
+    return 0;
+}